Q2. a) Briefly explain the principle of Operation of induction Motors (4)
b) What is slip for an induction motor? (4)
c) Draw a simple ladder logic diagram of star delta starting of an induction motor. (8)
Q3. With Respect to Insulated and Earthed Neutral Systems used on board:
a) Discuss the Advantages and Disadvantages of both Insulated and Earthed Systems used on board. (8)
b) What is earth fault and how do you identify Earth fault in the 440 V system onboard. (4)
c) Discuss the consequences of earth fault in an earthed distribution system. (4)
Q1. What is Zener diode and how does it regulate the voltage? What happens to the series current, load current and Zener current when the d.c input voltage of a Zener regulator increases? Draw a neat diagram of Zener regulator and explain. (16)
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